strident

Adjective

• unpleasantly loud and harsh

• being sharply insistent on being heard
  • strident demands
    
  • shrill criticism
    

• of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then')

• conspicuously and offensively loud; given to vehement outcry
  • blatant radios
    
  • a clamorous uproar
    
  • strident demands
    
  • a vociferous mob
    

Related words

• Synonyms: 
  raucous , shrill , fricative , continuant , sibilant , spirant , blatant , clamant , clamorous , vociferous